Renamed the io.[ch] files in serial_io.[ch]

Former-commit-id: 4c330ce2267ccb1cfe110a242bf1e93a3df0c606

src/Makefile.am

@@ -38,11 +38,11 @@ endif
 
 # List required headers
 include_HEADERS = space.h runner.h queue.h task.h lock.h cell.h part.h const.h \
-    engine.h swift.h io.h timers.h debug.h scheduler.h proxy.h parallel_io.h
+    engine.h swift.h serial_io.h timers.h debug.h scheduler.h proxy.h parallel_io.h
 
 # Common source files
 AM_SOURCES = space.c runner.c queue.c task.c cell.c engine.c \
-    io.c timers.c debug.c scheduler.c proxy.c parallel_io.c units.c
+    serial_io.c timers.c debug.c scheduler.c proxy.c parallel_io.c units.c
     
 # Sources and flags for regular library
 libswiftsim_la_SOURCES = $(AM_SOURCES)

src/io.c → src/serial_io.c

@@ -621,7 +621,7 @@ void writeArrayBackEnd(hid_t grp, char* fileName, FILE* xmfFile, char* name, enu
  * Calls #error() if an error occurs.
  *
  */
-void write_output (struct engine *e, int mpi_rank)
+void write_output (struct engine *e)
 {
   
   hid_t h_file=0, h_grp=0, h_grpsph=0;

src/swift.h

@@ -37,7 +37,7 @@
 #include "runner.h"
 #include "engine.h"
 #include "units.h"
-#include "io.h"
+#include "serial_io.h"
 #include "parallel_io.h"
 #include "debug.h"